package com.xuecheng.media.service.jobhandler;

import com.xuecheng.base.utils.Mp4VideoUtil;
import com.xuecheng.media.model.po.MediaProcess;
import com.xuecheng.media.service.MediaFileProcessService;
import com.xuecheng.media.service.MediaFileService;
import com.xxl.job.core.context.XxlJobHelper;
import com.xxl.job.core.handler.annotation.XxlJob;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.stereotype.Component;

import java.io.File;
import java.io.IOException;
import java.util.List;
import java.util.concurrent.*;

/**
 * @author Mr.M
 * @version 1.0
 * @description TODO
 * @date 2022/10/15 11:58
 */
@Slf4j
@Component
public class VideoTask {

    @Autowired
    MediaFileService mediaFileService;
    @Autowired
    MediaFileProcessService mediaFileProcessService;


    @Value("${videoprocess.ffmpegpath}")
    String ffmpegpath;

    @XxlJob("videoJobHandler")
    public void videoJobHandler() throws Exception {

        // 分片参数
    int shardIndex = XxlJobHelper.getShardIndex();
    int shardTotal = XxlJobHelper.getShardTotal();
    List<MediaProcess> mediaProcessList = null;
    int size = 0;
    try {
        //取出cpu核心数作为一次处理数据的条数
        int processors = Runtime.getRuntime().availableProcessors();
        //一次处理视频数量不要超过cpu核心数
        mediaProcessList = mediaFileProcessService.getMediaProcessList(shardIndex, shardTotal, processors);
        size = mediaProcessList.size();
        log.debug("取出待处理视频任务{}条", size);
        if (size < 0) {
            return;
        }
    } catch (Exception e) {
        e.printStackTrace();
        return;
    }
    //启动size个线程的线程池
    ExecutorService threadPool = Executors.newFixedThreadPool(size);
    //计数器
    CountDownLatch countDownLatch = new CountDownLatch(size);
    //将处理任务加入线程池
    mediaProcessList.forEach(mediaProcess -> {
        threadPool.execute(() -> {
            try {
                //任务id
                Long taskId = mediaProcess.getId();
                //抢占任务
                boolean b = mediaFileProcessService.startTask(taskId);
                if (!b) {
                    return;
                }
                log.debug("开始执行任务:{}", mediaProcess);
                //下边是处理逻辑
                //桶
                String bucket = mediaProcess.getBucket();
                //存储路径
                String filePath = mediaProcess.getFilePath();
                //原始视频的md5值
                String fileId = mediaProcess.getFileId();
                //原始文件名称
                String filename = mediaProcess.getFilename();
                //将要处理的文件下载到服务器上
                File originalFile = mediaFileService.downloadFileFromMinIO(mediaProcess.getBucket(), mediaProcess.getFilePath());
                if (originalFile == null) {
                    log.debug("下载待处理文件失败,originalFile:{}", mediaProcess.getBucket().concat(mediaProcess.getFilePath()));
                    mediaFileProcessService.saveProcessFinishStatus(mediaProcess.getId(), "3", fileId, null, "下载待处理文件失败");
                    return;
                }
                //处理结束的视频文件
                File mp4File = null;
                try {
                    mp4File = File.createTempFile("mp4", ".mp4");
                } catch (IOException e) {
                    log.error("创建mp4临时文件失败");
                    mediaFileProcessService.saveProcessFinishStatus(mediaProcess.getId(), "3", fileId, null, "创建mp4临时文件失败");
                    return;
                }
                //视频处理结果
                String result = "";
                try {
                    //开始处理视频
                    Mp4VideoUtil videoUtil = new Mp4VideoUtil(ffmpegpath, originalFile.getAbsolutePath(), mp4File.getName(), mp4File.getAbsolutePath());
                    //开始视频转换，成功将返回success
                    result = videoUtil.generateMp4();
                } catch (Exception e) {
                    e.printStackTrace();
                    log.error("处理视频文件:{},出错:{}", mediaProcess.getFilePath(), e.getMessage());
                }
                if (!result.equals("success")) {
                    //记录错误信息
                    log.error("处理视频失败,视频地址:{},错误信息:{}", bucket + filePath, result);
                    mediaFileProcessService.saveProcessFinishStatus(mediaProcess.getId(), "3", fileId, null, result);
                    return;
                }
    
                //将mp4上传至minio
                //mp4在minio的存储路径
                String objectName = getFilePath(fileId, ".mp4");
                //访问url
                String url = "/" + bucket + "/" + objectName;
                try {
                    mediaFileService.addMediaFilesToMinIO(mp4File.getAbsolutePath(), "video/mp4", bucket, objectName);
                    //将url存储至数据，并更新状态为成功，并将待处理视频记录删除存入历史
                    mediaFileProcessService.saveProcessFinishStatus(mediaProcess.getId(), "2", fileId, url, null);
                } catch (Exception e) {
                    log.error("上传视频失败或入库失败,视频地址:{},错误信息:{}", bucket + objectName, e.getMessage());
                    //最终还是失败了
                    mediaFileProcessService.saveProcessFinishStatus(mediaProcess.getId(), "3", fileId, null, "处理后视频上传或入库失败");
                }
            }finally {
                countDownLatch.countDown();
            }
        });
    });
    //等待,给一个充裕的超时时间,防止无限等待，到达超时时间还没有处理完成则结束任务
    countDownLatch.await(30, TimeUnit.MINUTES);
    }

    private String getFilePath(String fileMd5,String fileExt){
        return   fileMd5.substring(0,1) + "/" + fileMd5.substring(1,2) + "/" + fileMd5 + "/" +fileMd5 +fileExt;
    }

}